Adaptive Anti-Jam Radio

NORS (Networked OFDM Ranging System) is a complete positioning solution, composed of an engineered combination of innovative ranging, networking, waveform, and localization technologies. Technical components were selected to perform in the very environments where GPS is most susceptible to failure (urban and subterranean.) The proposed system also achieves GPS level accuracy over an existing communications infrastructure. The NORS system includes an innovative, narrowband ranging technique that is tightly coupled with the OFDM waveform. Furthermore, the implemented system will be capable of establishing range estimates by sniffing conventional JTRS-WNW OFDM data packets. With no transmitter modifications required, a NORS receiver can even derive range estimates from legacy equipment. A networked localization algorithm is also proposed for combining multiple range measurements into the triangulation of each node's absolute position. Range, position, velocity, and time information will be distributed over the network in a completely ad-hoc fashion. This will allow the flow of positioning information from advantaged nodes to disadvantaged (GPS-denied) nodes. The system has also been designed for low power consumption, achieved via a one-way passive ranging algorithm that sharply reduces the amount of data transmitted and through intelligent networking methods that take each node's power attributes into consideration when establishing routes.